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Consolidated Statement of Shareholders Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income, net of tax [Member]
Common stock - shares outstanding, beginning balance at Dec. 31, 2015   29,738,976        
Stockholders' Equity Attributable to Parent at Dec. 31, 2015 $ 55,414 $ 34 $ 158,674 $ (13,938) $ (85,034) $ (4,322)
Treasury stock - shares, beginning balance at Dec. 31, 2015       4,417,585    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Value, New Issues   96,870        
Proceeds from Stock Options Exercised 889   889      
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   682,112        
Stock Issued During Period, Value, Restricted Stock Award, Gross (5,466) $ 1 (5,467)      
Stock Issued During Period, Shares, Employee Stock Purchase Plans   65,693        
Proceeds from Stock Plans 1,090   1,090      
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition 20,492   20,492      
Share-based Compensation 20,466          
Other Comprehensive Income (Loss), Net of Tax (588)         (588)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (594)          
Net Income (Loss) Attributable to Parent (75,225)          
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest         (75,225)  
Stockholders' Equity Attributable to Parent at Dec. 31, 2016 (3,394) $ 35 175,678 $ (13,938) (160,259) (4,910)
Treasury stock - shares, ending balance at Dec. 31, 2016       4,417,585    
Common stock - shares outstanding, ending balance at Dec. 31, 2016   30,583,651        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Value, New Issues   651,607        
Exercise of stock options   $ 1        
Proceeds from Stock Options Exercised 6,331   6,330      
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   611,708        
Stock Issued During Period, Value, Restricted Stock Award, Gross (7,375)   (7,375)      
Stock Issued During Period, Shares, Employee Stock Purchase Plans   92,209        
Proceeds from Stock Plans 1,535   1,535      
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition 22,910   22,910      
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt 8,846   8,846      
Share-based Compensation 22,796          
Other Comprehensive Income (Loss), Net of Tax 2,094         2,094
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 2,107          
Net Income (Loss) Attributable to Parent (77,926)          
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest         (77,926)  
Stockholders' Equity Attributable to Parent at Dec. 31, 2017 $ (46,979) $ 36 207,924 $ (13,938) (238,185) (2,816)
Treasury stock - shares, ending balance at Dec. 31, 2017 4,417,585     4,417,585    
Common stock - shares outstanding, ending balance at Dec. 31, 2017 31,939,175 31,939,175        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Value, New Issues   161,997        
Exercise of stock options   $ 1        
Proceeds from Stock Options Exercised $ 1,142   1,141      
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   609,188        
Stock Issued During Period, Value, Restricted Stock Award, Gross $ (9,410) $ 1 (9,411)      
Stock Issued During Period, Shares, Employee Stock Purchase Plans 75,546 75,546        
Proceeds from Stock Plans $ 1,720   1,720      
Stock Issued During Period, Shares, Secondary Offering   4,370,000        
Stock Issued During Period, Value, Secondary Offering   $ 4 141,950      
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition 21,553   21,553      
Cumulative effect of adoption of section 606 9,723       9,723  
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt 141,954          
Share-based Compensation 21,453          
Other Comprehensive Income (Loss), Net of Tax (558)         (558)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (558)          
Net Income (Loss) Attributable to Parent (64,246)       (64,246)  
Stockholders' Equity Attributable to Parent at Dec. 31, 2018 $ 54,899 $ 42 $ 364,877 $ (13,938) $ (292,708) $ (3,374)
Treasury stock - shares, ending balance at Dec. 31, 2018 4,417,585     4,417,585    
Common stock - shares outstanding, ending balance at Dec. 31, 2018 37,155,906 37,155,906